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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year $ 15,184 $ 15,362 $ 16,359
Net Income (Loss) (123) 57  
Reclassification Adjustments 20 15  
Balance at End of Year 14,791 15,184 15,362
Pensions and other postretirement liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (421) (497)  
Net Income (Loss) (125) 61  
Reclassification Adjustments 20 15  
Balance at End of Year (526) (421) (497)
Other comprehensive income of equity investees      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (70) (66)  
Net Income (Loss) 2 (4)  
Reclassification Adjustments 0 0  
Balance at End of Year (68) (70) (66)
Accumulated other comprehensive loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (491) (563) (356)
Balance at End of Year $ (594) $ (491) $ (563)